Probing new U(1) gauge symmetries via exotic Z → Z′γ decays
- Publication type:
- Journal article
- Metadata:
-
- Autoren
- Lisa Michaels
- Felix Yu
- Autoren-URL
- https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000629645800004&DestLinkType=FullRecord&DestApp=WOS_CPL
- DOI
- 10.1007/JHEP03(2021)120
- Externe Identifier
- Clarivate Analytics Document Solution ID: QX9EW
- ISSN
- 1029-8479
- Ausgabe der Veröffentlichung
- 3
- Zeitschrift
- JOURNAL OF HIGH ENERGY PHYSICS
- Schlüsselwörter
- Anomalies in Field and String Theories
- Beyond Standard Model
- Effective Field Theories
- Spontaneous Symmetry Breaking
- Artikelnummer
- ARTN 120
- Datum der Veröffentlichung
- 2021
- Status
- Published
- Titel
- Probing new U(1) gauge symmetries via exotic <i>Z</i> → <i>Z′γ</i> decays
- Sub types
- Article
Data source: Web of Science (Lite)
- Other metadata sources:
-
- Abstract
- <jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>New U(1) gauge theories involving Standard Model (SM) fermions typically require additional electroweak fermions for anomaly cancellation. We study the non-decoupling properties of these new fermions, called anomalons, in the <jats:italic>Z − Z′ − γ</jats:italic> vertex function, reviewing the connection between the full model and the effective Wess-Zumino operator. We calculate the exotic <jats:italic>Z → Z′γ</jats:italic> decay width in U(1)<jats:sub><jats:italic>B−L</jats:italic></jats:sub> and U(1)<jats:sub><jats:italic>B</jats:italic></jats:sub> models, where <jats:italic>B</jats:italic> and <jats:italic>L</jats:italic> denote the SM baryon and lepton number symmetries. For U(1)<jats:sub><jats:italic>B−L</jats:italic></jats:sub> gauge symmetry, each generation of SM fermions is anomaly free and the exotic <jats:italic>Z →</jats:italic><jats:inline-formula><jats:alternatives><jats:tex-math>$$ {Z}_{BL}^{\prime}\gamma $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Z</mml:mi> <mml:mi>BL</mml:mi> <mml:mo>′</mml:mo> </mml:msubsup> <mml:mi>γ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> decay width is entirely induced by intragenerational mass splittings. In contrast, for U(1)<jats:sub><jats:italic>B</jats:italic></jats:sub> gauge symmetry, the existence of two distinct sources of chiral symmetry breaking enables a heavy, anomaly-free set of fermions to have an irreducible contribution to the <jats:italic>Z →</jats:italic><jats:inline-formula><jats:alternatives><jats:tex-math>$$ {Z}_B^{\prime}\gamma $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Z</mml:mi> <mml:mi>B</mml:mi> <mml:mo>′</mml:mo> </mml:msubsup> <mml:mi>γ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> decay width. We show that the current LEP limits on the exotic <jats:italic>Z →</jats:italic><jats:inline-formula><jats:alternatives><jats:tex-math>$$ {Z}_B^{\prime}\gamma $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Z</mml:mi> <mml:mi>B</mml:mi> <mml:mo>′</mml:mo> </mml:msubsup> <mml:mi>γ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> decay are weaker than previously estimated, and low-mass <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {Z}_B^{\prime } $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Z</mml:mi> <mml:mi>B</mml:mi> <mml:mo>′</mml:mo> </mml:msubsup> </mml:math></jats:alternatives></jats:inline-formula> dijet resonance searches are currently more constraining. We present a summary of the current collider bounds on U(1)<jats:sub><jats:italic>B</jats:italic></jats:sub> and a projection for a TeraZ factory on the <jats:italic>Z →</jats:italic><jats:inline-formula><jats:alternatives><jats:tex-math>$$ {Z}_B^{\prime}\gamma $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Z</mml:mi> <mml:mi>B</mml:mi> <mml:mo>′</mml:mo> </mml:msubsup> <mml:mi>γ</mml:mi> </mml:math></jats:alternatives></jats:inline-formula> exotic decay, and emphasize how the <jats:italic>Z → Z′γ</jats:italic> decay is emblematic of new anomalous U(1) gauge symmetries.</jats:p>
- Autoren
- Lisa Michaels
- Felix Yu
- DOI
- 10.1007/jhep03(2021)120
- eISSN
- 1029-8479
- Ausgabe der Veröffentlichung
- 3
- Zeitschrift
- Journal of High Energy Physics
- Sprache
- en
- Artikelnummer
- 120
- Online publication date
- 2021
- Datum der Veröffentlichung
- 2021
- Status
- Published
- Herausgeber
- Springer Science and Business Media LLC
- Herausgeber URL
- http://dx.doi.org/10.1007/jhep03(2021)120
- Datum der Datenerfassung
- 2021
- Titel
- Probing new U(1) gauge symmetries via exotic Z → Z′γ decays
- Ausgabe der Zeitschrift
- 2021
Data source: Crossref
- Autoren
- Lisa Michaels
- Felix Yu
- DOI
- 10.1007/JHEP03(2021)120
- Zeitschrift
- JHEP
- Notes
- archiveprefix: arXiv primaryclass: hep-ph reportnumber: MITP/20-052
- Paginierung
- 120 - 120
- Datum der Veröffentlichung
- 2021
- Datum der Datenerfassung
- 2021
- Titel
- Probing new U(1) gauge symmetries via exotic Z → Z′γ decays
- Ausgabe der Zeitschrift
- 03
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